JPH11202747A - Composited hologram, manufacture thereof and optical marking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composited hologram capable of faithfully recording and reproducing entire information by forming the entire information by combining partial holograms, butting the partial holograms so as not to leave the non-recorded part of the information between them and combining respective transparent substrates so as to be optical characteristics continuous. SOLUTION: Partial information obtained by dividing the entire information is recorded on a dry plate provided with the transparent substrate 3 and a recording material 4, and the plural partial holograms 2 are formed. The partial holograms 2 are constituted by successively sticking the recording material 4 and a protective film 5 to the transparent substrate 3 of glass or an acrylic resin or the like. Then, the part of the recording material 4 where the information is recorded reaches the end of the partial hologram 2 and the respective partial holograms 2 are connected with each other at an abutting part 6. Further, the transparent substrates 3 are adhered with each other by the adhesive material of the same or almost same refractive index and the refractive index and transmissivity are continuous between the respective transparent substrates 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a synthetic hologram, a method for producing the same, and an optical marking device.

[0002]

2. Description of the Related Art Conventionally, various signs have been used for various purposes such as advertisement, advertisement, guidance, and warning. The most typical one is one in which information is written on an iron plate or a resin plate, and is used for road signs, signboards and the like. In addition, as a sign using light, there is an electric bulletin board or the like in which a high-luminance light-emitting lamp or a light-emitting diode is arranged in a plane, and information is created and transmitted by lighting the lamp.

On the other hand, the holography technique is a technique capable of displaying a three-dimensional image without a screen, and if this technique is used, there is a possibility that a sign which is more characteristic than a sign which can only produce conventional planar information may be produced. Can be considered. However, at present, it is hardly used as a large marker. In order to apply holography technology to signs and the like, it is necessary to establish a technology to create large holograms. However, in order to create a large hologram, expensive large optical components (lens, mirror, concave mirror, etc.) and a high-power laser light source are required, and the obtained hologram is also expensive. For this reason, the entire information is divided into small partial information, a small hologram (partial hologram) in which partial information is recorded using small optical components is created, and the obtained partial holograms are combined to form a whole. A method of obtaining a large synthetic hologram on which information is formed is considered.

[0004]

However, the reproduced image of the synthesized hologram obtained in this manner has discontinuous portions and dark portions of information, and is far from a level at which the information to be conveyed at a glance can be understood. .

It is an object of the present invention to provide a synthetic hologram capable of faithfully recording and reproducing the entire information, a method of manufacturing the same, and an optical labeling device.

[0006]

In order to achieve this object, a first synthetic hologram of the present invention records partial information obtained by dividing whole information on a dry plate having a transparent substrate and a recording material. To form a plurality of small holograms (partial holograms), combine these partial holograms to form the entire information, and butt together so that there is no unrecorded portion where no information is recorded between the partial holograms. Further, the transparent substrates are combined so that the optical characteristics are continuous.

The first method for producing a synthetic hologram according to the present invention comprises a first step of obtaining partial information by dividing the entire information, a second step of preparing an original from the partial information, and a method of making the hologram recording material transparent. A third step of forming a dry plate by coating or laminating the substrate, a fourth step of recording partial information on the dry plate to obtain a partial hologram, and a third step of deleting a portion of the partial hologram where the partial information is not recorded. And a sixth step of abutting the partial holograms and bonding the transparent substrates with an adhesive having the same or substantially the same refractive index as the transparent substrates.

The first optical labeling device of the present invention uses a first synthetic hologram and includes a reproduction illumination light source for irradiating the first synthetic hologram with light.

Further, a second synthetic hologram of the present invention comprises:
The partial information obtained by dividing the whole information on a dry plate having a transparent substrate and a recording material is recorded to form a plurality of small holograms (partial holograms), and the whole information is formed by combining these partial holograms; The synthetic hologram is 1
It is sandwiched between the one transparent substrate and the one holding plate by abutting on the transparent substrate of one piece so that there is no unrecorded portion where no information is recorded between the partial holograms. It is integrated.

In a second method of manufacturing a synthetic hologram according to the present invention, a step I of obtaining partial information by dividing entire information
And a step II of preparing a manuscript from partial information, and a step III of forming a dry plate by sandwiching a hologram recording material between transparent substrates.
A step IV of recording partial information on the dry plate to obtain a partial hologram, a step V of deleting a part of the partial hologram where the partial information is not recorded, and a step of placing the partial hologram on a single transparent substrate. Step VI of abutting and sandwiching and integrating between the one transparent substrate and the one pressing plate
And characterized in that:

A second optical labeling device of the present invention uses a second synthetic hologram and includes a reproduction illumination light source for irradiating the synthetic hologram with light.

[0012]

With the above arrangement, the first synthetic hologram of the present invention has no information unrecorded portion between partial holograms, thereby preventing the occurrence of discontinuous information and preventing optical interference between transparent substrates. Since the characteristics are continuous, it has an effect of suppressing irregular reflection on the substrate portion when the reproduction illumination light is irradiated, and preventing the occurrence of a dark portion.

Further, according to the first method for producing a composite hologram of the present invention, it is possible to obtain a composite hologram having no discontinuity of information between partial holograms and no dark part.

Further, the first optical labeling device of the present invention can faithfully reproduce information to be transmitted by irradiating the synthetic hologram with reproduction illumination light.

Further, the second composite hologram of the present invention has an effect of preventing generation of a discontinuous portion of information between partial holograms.

Further, according to the second method for producing a synthetic hologram of the present invention, it is possible to obtain a synthetic hologram free of discontinuity of information between partial holograms and occurrence of dark portions.

Further, the second optical labeling device of the present invention can realize an optical label using a synthetic hologram capable of faithfully reproducing information to be transmitted by irradiating a reproduction illumination light.

Hereinafter, embodiments of the present invention will be described. (Embodiment 1) FIGS. 1A and 1B show a structure of a composite hologram according to Embodiment 1 of the present invention, in which a composite hologram 1 is composed of six partial holograms 2. FIG. . The partial hologram 2 is obtained by sequentially attaching a recording material 4 and a protective film 5 to a transparent substrate 3 such as glass or acrylic. Then, the portion of the recording material 4 where the information is recorded (shown by oblique lines) reaches the end of the partial hologram 2, and the respective partial holograms 2 abut each other.
Connected by Further, the transparent substrates 3 are adhered to each other with an adhesive having the same or substantially the same refractive index, so that the refractive index and the transmittance are continuous between the transparent substrates 3. FIG.
7A and 7B, the butt 6 is shown by a solid line to clarify the structure.

Next, an example of an optical system for producing a reflection hologram is shown in FIG. A laser beam 8 emitted from a laser light source 7 is split into two laser beams by a beam splitter 9. One laser beam is changed in direction by the reflection mirror 10 and then the objective lens 11 and the pinhole 12 are changed.
The light passes through to remove light noise, is converted into divergent light, and enters the lens 13. This Kamaboko lens 13
After being converted into a parallel light beam 14, the reference light 17 incident on the dry plate holder 16 is obtained by the large reflection mirror 15.

On the other hand, the other laser beams are reflected mirror 1
After the direction is changed by the document holders 8 and 19, the document holder 22 is passed through the cylindrical lens 20 and the diffuser 21.
Becomes divergent light 23 that passes through. When a document having information to be recorded is set in the document holder 22, the divergent light 23 becomes object projection light 24 including information of the document (generally, an object) when transmitted through the document holder 22. Since the object projection light 24 and the reference light 17 interfere with each other, if the recording material is held in the dry plate holder 16, a hologram in which the interference result is recorded can be obtained. When illumination light for reproduction is applied to the obtained hologram from the opposite direction to the reference light 17,
A reproduced image is formed at the position where the document was located (conjugate reproduction).
The size of the hologram that can be created at a time depends on the size of the original and the dry plate, as well as the size of the luminous flux of the reference light 17. In order to increase the luminous flux of the reference light 17, a large camera lens 13 or a large A reflective mirror 15 is required, and these optical components are very expensive. Further, since these optical systems are arranged on the precision anti-vibration table 25, they become more expensive.

Next, the first method for producing a synthetic hologram will be described with reference to an optical system (FIG. 2) and a flowchart (FIG. 3). First, what is first performed in the first step 3A is to grasp the size, color, design, and the like of the entire information to be displayed. FIG. 4 shows an example of the general information 26. This whole information 2
Each character of No. 6 has a size of 30 cm square and is assumed to be used as a road sign. The character is displayed in black and the background color is displayed in green. Next, the number of divisions is determined in consideration of the maximum possible hologram size in the optical system (FIG. 2). In FIG. 5, the horizontal axis is X1, X2, X3, and the vertical axis is Y1, Y
An example in which the data is divided into six pieces of partial information 27 with a size of 2 has been described.

Next, the second step 3B in the flowchart (FIG. 3) will be described. In the step of converting the partial information 27 into a document, specifically, the partial information 27 is enlarged or reduced using CAD or the like, and printed on an OHP sheet or a glass plate to obtain a document. Since no light passes through the area where the character pattern (black) is printed, nothing is recorded, and the area looks black during reproduction.
Interference fringes are recorded in portions where light is transmitted, and light of the wavelength used for recording selectively forms a reproduced image during reproduction, so that the portion looks colored. In the case of the optical system (FIG. 2), the object projection light 24 is divergent light starting from the diffuser 21, so that the document size may be smaller than the dry plate size, and the dimensions can be determined by geometric calculation.

Next, the third step 3C in the flowchart (FIG. 3) will be described. The third step 3C is a step of obtaining a dry plate 28 for forming a partial hologram, and includes preparation of the transparent substrate 3, preparation of an unrecorded recording material 29, and drying by bonding. Commercially available recording materials for holograms have a photopolymer layer of about 20 microns formed between two protective films. Therefore, 1
The recording material 29 from which the protective film has been peeled is applied to the transparent substrate 3.
Then, a dry plate 28 (FIGS. 6A and 6B) is obtained.
In addition, as the recording material 29, a silver salt-based photosensitizer, gelatin dichromate, and the like are known. In these cases, the dry film 28 is adhered to the transparent substrate 3 by a coating method, and the protective film 5 is stuck thereon. Is obtained. Here, the dry plate 28 is large enough to record partial information, and
What is necessary is just to have the magnitude | size of the fixing margin for fixing to.

Next, the fourth step 3D in the flowchart (FIG. 3) will be described. That is, this is a step of attaching the original prepared in the second step 3B to the original holder 22, and attaching the dry plate 28 prepared in the third step 3C to the dry plate holder 16, and exposing it to obtain a partial hologram. First, a detailed example of the dry plate holder 16 is shown in FIGS. The dry plate holder 16 includes a fixing screw 30, a holding plate 31, a fixing plate 32, a support 33, a magnet stand 34, and the like. Then, the dry plate 28 may be set between the fixed plate 32 and the holding plate 31, and the fixing screw 30 may be tightened to fix the dry plate 28. The structure of the document holder 22 is basically the same.
The original may be fixed in the same manner.

When creating a hologram, first, an original is set on the original holder 22, and white paper is set on the dry plate holder 16. Next, a green laser beam is extracted by selecting the wavelength of the laser, and the object projection light 24 from the original and the reference light 17 are irradiated on the dry plate holder 16 so that the original information is completely projected on the dry plate holder 16. Make sure that Further, the intensity distribution and the total light amount of the object projection light 24 and the reference light 17 are calculated, and the exposure time is determined. In the case of a commercially available photopolymer, a light amount value of about 40 mJ / square cm may be sufficient, and the exposure time may be calculated so that the value of total light amount × time becomes the light amount value. After the above confirmation, the laser beam is shut off by a shutter or the like, and the third
The dry plate 28 created in step 3C is mounted. After the vibration and the like have stopped for a while, the shutter is opened and the exposure is performed for the calculated exposure time, and the interference result between the object projection light and the reference light is recorded on the dry plate 28.

After the recording is completed, the dry plate 28 is removed, and ultraviolet light exposure is performed to stabilize the dry plate 28, thereby obtaining a partial hologram. Similarly, the original and the dry plate are replaced, and exposure is performed a total of six times to obtain six partial holograms. (FIG. 8 (a)
(B) In the partial hologram 35 at this stage, the recording material 4 on which information is recorded and the unrecorded recording material 29 on which no information is recorded are mixed. The unrecorded recording material 29 is generated because the dry plate 28 is sandwiched between the dry plate holders 16 and is not used for recording information.

Next, the fifth step 3E in the flowchart (FIG. 3) will be described. In the fifth step 3E, the transparent substrate 3, the unrecorded recording material 29, and the protective film 5 located in the unrecorded portion of the information are deleted from the partial hologram 35.
The partial hologram 36 obtained by this deleting operation is shown in FIG.
(A) and (b).

Next, the sixth step 3F in the flowchart (FIG. 3) will be described. In the sixth step 3F, FIG.
(A) Combine the partial holograms 36 shown in (b) so as to make the whole information by abutting, and bond the transparent substrates 3 with an ultraviolet curable resin or an acrylic adhesive so that the optical characteristics are continuous so that the whole This is a step of obtaining a composite hologram 1 on which information is recorded. The adhesive may be selected in consideration of the fact that the cured product is transparent and that the cured product has the same or almost the same refractive index as the transparent substrate 3. As a result of the study, if care is taken not to leave air bubbles at the time of bonding, a transparent adhesive having a refractive index of 1.0 to 2.0, particularly preferably 1.5 to 1.7 may be used.
It can be easily selected from commercially available products.

FIG. 10 shows a reproduced image 39 obtained by irradiating the obtained synthetic hologram 1 with reproducing illumination light to obtain a reproduced image. The reproduced image 39 has no discontinuity or dark portion of the information, and the entire information (FIG. 4) to be faithfully recorded can be reproduced. Also,
For comparison, FIG. 11 shows a reproduced image 39X of a composite hologram created by using the partial hologram 35 having an unrecorded portion of information, and the information to be recorded due to occurrence of a dark portion or discontinuity of information is faithfully recorded. Could not play.

Next, an optical labeling device using the synthetic hologram 1 will be described with reference to FIGS. The synthetic hologram 1 obtained in the first embodiment is mounted on the ceiling of a passage in an underground parking lot, and the illumination light source 37 for reproduction is mounted on the side wall.
The reproduction illumination light 38 is applied to the synthetic hologram 1 to reproduce a reproduction image 39.
Were placed so that they could be seen by the driver while driving, and evaluated as an optical marking device. This optical marking device is shown in FIG.
As shown in (a) and (b), the obtained reproduced image 39 faithfully reproduces the entire information 26 (FIG. 4), and it was confirmed that the information to be conveyed at a glance could be determined and used as an optical marker.

FIGS. 13A and 13B show the structure of a synthetic hologram 40 according to the second embodiment of the present invention.
This synthetic hologram 40 is composed of a plurality of partial holograms 43 composed of a recording material 4 and a protective film 5 between a single transparent substrate 41 and a holding plate 42 so that there is no unrecorded portion between each partial hologram. It is constructed by matching. In FIGS. 13A and 13B, reference numeral 6 denotes a butted portion. Further, each partial hologram 43 records different partial information, and the whole information 26 is formed by the entire synthetic hologram 40. As the recording material 4, a photopolymer type, a silver salt type photosensitizer, gelatin dichromate, a photoresist and the like can be used.

Next, a method of manufacturing the synthetic hologram 40 will be described with reference to an optical system (FIG. 2) and a flowchart (FIG. 14).

First, what is first performed in the process I is to grasp the size, color, design, etc. of the whole information to be displayed. For example, the whole information 26 shown in FIG. 4 is selected as an example.
Next, the number of divisions is determined in consideration of the maximum hologram size that can be created by the optical system (FIG. 2) (FIG. 5).

Next, step II will be described. This process
II is a process of converting the partial information into a manuscript. Specifically, the partial information 27 is enlarged or reduced
The original is printed on a sheet or a glass plate (the details are the same as the second step in the flowchart (FIG. 3)). Although not shown, the dimensions are calculated from the optical system and enlarged or reduced,
For example, a document having partial information printed on a glass plate is formed.

Step III comprises the steps of preparing a transparent substrate, preparing a recording material, and drying the plate. The dry plate 44 obtained in this step has a structure in which the recording material 29 is sandwiched between the transparent substrates 3 and 3, and is characterized in that the recording material 29 and the transparent substrate 3 are not mounted (FIG. 15). In addition, dry plate 4
The size of 4 may be any size as long as an area necessary for recording the partial information and a margin for fixing to the dry plate holder 16 are added. When another recording material is used, the same operation can be performed by coating the recording material on the protective film 5 and further covering the protective film with the protective film.

Step IV is a step of setting the original obtained in Step II and the dry plate 44 obtained in Step III in an optical system (FIG. 2) to obtain a partial hologram 45 in which information of the original is recorded. Details are the same as the third step of the flowchart (FIG. 3). FIGS. 16A and 16B show the partial hologram 45 obtained in the step IV. The partial hologram 45 obtained here is composed of the protective film 5, the recording material 4 on which information is recorded, and the unrecorded recording material 29 on which no information is recorded, and does not include a single transparent substrate 3.

Next, in order to delete an unrecorded portion, a step V deletes an unrecorded portion where no information is recorded from the partial hologram 45 obtained in the step IV. The partial hologram 43 obtained in this step V is a recording material 4 on which information is recorded.
And the protective film 5.

Step VI is a step of arranging the partial holograms 43 obtained in step V on a single transparent substrate 41 and abutting them with a single pressing plate 42 to integrate them. . Partial hologram 4 sandwiched in this process VI
3 may be temporarily fixed with a transparent adhesive so as not to move.

The structure of the synthetic hologram obtained in step VI is the same as that of the synthetic hologram 4 shown in FIGS.
Same as 0.

The reproduced image obtained by using the synthetic hologram 40 and irradiating the reproduction illumination light under the same conditions as in the first embodiment to obtain a reproduced image is exactly the same as in the first embodiment. It is possible to faithfully reproduce the entire original information.
For comparison, a reproduction image 39X (FIG. 17) of a composite hologram created using the partial hologram 45 with the unrecorded recording material 29 on which no information is recorded remains discontinuous. The information to be recorded cannot be faithfully recorded and reproduced. For this reason, it is important to delete the unrecorded recording material 29.

The evaluation as a marker was performed using the synthetic hologram 40 described in the second embodiment in the same manner as in the first embodiment, but the reproduced image 39 obtained was obtained by faithfully recording the recorded information. Overall information 26 that you are playing and you want to convey at a glance
Was discriminated and it was confirmed that it could be used as an optical marker.

[0042]

As is apparent from the above description, the synthetic hologram of the present invention uses partial holograms, which are relatively small optical components, so that there is no occurrence of discontinuous portions or dark portions of information. It is possible to provide a large hologram that can be faithfully reproduced.

Further, the method for producing a synthetic hologram of the present invention can provide a synthetic hologram in which information to be conveyed is faithfully recorded using relatively small optical components.

Further, according to the optical labeling device of the present invention, it is possible to provide an optical label using a large hologram that can faithfully record and reproduce information to be conveyed and determine the entire information to be conveyed at a glance.

[Brief description of the drawings]

FIG. 1A is a front view showing a structure of a synthetic hologram according to a first embodiment of the present invention. FIG.

FIG. 2 is a configuration diagram showing an example of an optical system for producing a reflection hologram;

FIG. 3 is a flowchart showing a method for producing a synthetic hologram of the present invention.

FIG. 4 is a plan view showing an example of overall information.

FIG. 5 is a front view showing an example of division of whole information into partial information;

FIG. 6A is a front view showing the structure of a dry plate. FIG.

7A is a front view showing an example of a dry plate holder, and FIG.

FIG. 8A is a front view of a partial hologram having an unrecorded portion. FIG.

FIG. 9A is a front view of a partial hologram from which an unrecorded portion is deleted. FIG.

FIG. 10 is a front view showing an example of a reproduced image of a synthetic hologram.

FIG. 11 is a front view showing a comparative example of a reproduced image of a synthetic hologram.

FIG. 12 (a) is a front view showing an example of an optical marker using the synthetic hologram according to the present invention.

13A is a front view of a synthetic hologram according to the second embodiment of the present invention, and FIG.

FIG. 14 is a flowchart showing a method for producing a synthetic hologram of the present invention.

FIG. 15 is a side view showing the structure of a dry plate obtained in step III.

FIG. 16 (a) is a front view of a partial hologram obtained in step IV, and (b) is a side view thereof.

FIG. 17 is a front view showing a comparative example of a reproduced image of a synthetic hologram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic hologram 2 Partial hologram 3 Transparent substrate 4 Recording material on which information was recorded 5 Protective film 6 Butt portion 26 Overall information 27 Partial information 28 Dry plate 29 Unrecorded recording material 35 Partial hologram immediately after exposure 36 Unrecorded portion was deleted Partial hologram 37 Reconstruction illumination light source 38 Reconstruction illumination light 39 Reconstructed image 40 Synthetic hologram 41 One transparent substrate 42 One retainer plate 43 Partial hologram 44 Dry plate 45 Partial hologram 3A First step 3B Second step 3C Third Step 3D Fourth step 3E Fifth step 3F Sixth step

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 19/12 G09F 19/12 L

Claims (6)

[Claims] 1. A dry plate having a transparent substrate and a recording material,
The partial information obtained by dividing the whole information is recorded to form a plurality of small holograms (partial holograms), these partial holograms are combined to form the whole information, and information is recorded between the partial holograms. Synthetic holograms that are combined so that there is no unrecorded part that does not exist and that the optical characteristics between the transparent substrates are continuous. 2. A first method of dividing entire information to obtain partial information.
A step of creating a document from the partial information;
A third step of applying or attaching a hologram recording material to a transparent substrate to form a dry plate, a fourth step of recording partial information on the dry plate to obtain a partial hologram, and not recording partial information of the partial hologram A synthetic hologram comprising: a fifth step of removing a portion; and a sixth step of abutting the respective partial holograms and bonding the transparent substrates with an adhesive having the same or substantially the same refractive index as the transparent substrate. Manufacturing method. 3. Using the synthetic hologram according to claim 1,
An optical marking device provided with a reproduction illumination light source for irradiating the synthetic hologram with light. 4. A dry plate having a transparent substrate and a recording material,
The partial information obtained by dividing the whole information is recorded to form a plurality of small holograms (partial holograms), and these partial holograms are combined to form the whole information. Combined by sandwiching it between the one transparent substrate and the one pressing plate, butted so that there is no unrecorded portion on which no information is recorded between the partial holograms. hologram. 5. A step I for obtaining partial information by dividing the whole information, a step II for preparing an original from the partial information, and a step II for forming a dry plate with a hologram recording material sandwiched between transparent substrates.
I, a step IV of recording partial information on the dry plate to obtain a partial hologram, a step V of deleting a portion of the partial hologram where no partial information is recorded, and a step of removing the partial hologram on a single transparent substrate. A step of sandwiching and integrating the one-piece transparent substrate and the one-piece holding plate with each other
6. A method for producing a synthetic hologram, comprising: 6. Use of the synthetic hologram according to claim 4,
An optical marking device provided with a reproduction illumination light source for irradiating the synthetic hologram with light.